Karnstein doesn't do much to hide his debauchery, he freely practices his satanic rituals in his castle on the hill. The problem is his everyday virgin sacrifice is beginning to bore him, he wants a higher position in the servitude of the Prince of Darkness, a request that is soon granted when one of his blood sacrifices awakens an old ancestor named Mircalla. Mircalla turns Count Karnstein into a vampire that he may serve the Devil on Earth forever! Meanwhile Frieda, the more rambunctious of the Gellhorn twins, begins to rebel against the discipline of Uncle Gustav and soon finds herself enjoying the company of Count Karnstein, who promptly turns her into a vampire. With two vampires running around the death toll starts to add up and once Gustav realizes one of them is his niece the pressure is on to finally put an end to Count Karnstein's evil ways.
Lust For A Vampire on the overall entertainment value scale, I'll explain why shortly. First off while this may be the third film in the trilogy it chronologically takes place before the first two films and is thus referred to as a prequel. The main character of the first two films, Mircalla, only makes and brief appearance this time around, instead it's Count Karnstein, who had a rather limited role in the first two, who takes the lead as the film's main vampire and villain.
The "Twins of Evil" where played by sisters Madeleine and Mary Collinson, both eighteen years old and cast as the lead eye candy after the producers spotted them in the October 1970 issue of Playboy magazine. Having been born in Malta, their English was a little shaky, so once again the magic of dubbing was used to give them a crisp British accent, which strangely reminded me of Haley Mills, and the fact they're twins didn't help to obscure The Parent Trap feelings I had at times. The true praise in the film goes to veteran Peter Cushing, who gives a wonderful performance as the girl's puritanical uncle whose bent on ridding the village of Satan's disciples, unfortunately most of the people he and his group murder are ironically quite innocent! Cushing really out performs everyone to a point that he probably gives the best performance out of any of the actors in all three of the films.
Now to the reason Twins of Evil fails to be my favorite, it's mainly the fault of the story. It's possibly another case of bad editing, but I'm quite certain I have the original UK cut. Everything seemed to occur so quickly that I was left with the feeling I was missing the transitioning between certain major plot points in the film. For example the girls arrive at their new home where Frieda is instantly against everything. She sneaks out the Karnstein Castle uninvited and becomes and vampire, where she then roams the countryside feeding on people. All of this seems to occur in a period of a couple days, and the film jumps around without ever seemingly indicating how much time is passing between these occurrences or explaining how we got there. Frankly, I felt at times I was watching a film that had some key transitional scenes cut out, and since I'm quite sure I have original cut of the film I can only assume it's poor editing which causes the flow of the story to appear a little choppy.
Other than the flow I enjoyed everything else about Twins of Evil. It's by far the darkest of the trilogy, yet on the flip-side probably the tamest in terms the sexual themes compared to the first two, making it more of a traditional horror film compared to the first two entries in the trilogy. Overall, if you enjoyed the first two I'd say you'd be pretty safe in expecting the same, if not greater enjoyment out of this one, I might not count it as the best, but I do consider it to be a worthy addition to the series.